Prediction: (You saw it here first!)The Mountain King will not have any ranged attacks.

It will have text similar to MK I epic Doomshaper's Warbeast Bond:"This warbeast may make double-handed throw, headbutt, headlock/weapon lock, rend(!), and throw power attacks as normal melee attacks but cannot make power attacks in place of a charge attack."

TrollbloodScrum -Defined-

The word "scrummage" is a modification of "scrimmage" (the form of the word previously used in rugby and still used in American and Canadian football), which in turn derives from or is a cognate of "skirmish". The term was used in the laws of rugby union for a long time before being permanently contracted to just "scrum". ~Wikipedia